https://github.com/thehcginstitute-com/m1/issues/590

app/code/community/Ebizmarts/MailChimp/Model/ProcessWebhook.php

@@ -18,7 +18,7 @@ function __construct() {
  $this->_interestGroupHandle = Mage::getModel('mailchimp/api_subscribers_InterestGroupHandle');
  }
 
- function saveWebhookRequest(array $data) {
+ function saveWebhookRequest(array $data):void {
  Mage::getModel('mailchimp/webhookrequest')
  ->setType($data['type'])
  ->setFiredAt($data['fired_at'])
@@ -31,7 +31,7 @@ function saveWebhookRequest(array $data) {
  *
  * @return void
  */
- function processWebhookData()
+ function processWebhookData():void
  {
  $collection = Mage::getModel('mailchimp/webhookrequest')->getCollection();
  $collection->addFieldToFilter('processed', array('eq' => 0));
@@ -66,7 +66,7 @@ function processWebhookData()
  /**
  * @param $webhookRequest
  */
- private function _saveProcessedWebhook($webhookRequest)
+ private function _saveProcessedWebhook($webhookRequest):void
  {
  $webhookRequest->setProcessed(1)->save();
  }
@@ -77,7 +77,7 @@ private function _saveProcessedWebhook($webhookRequest)
  * @param array $data
  * @return void
  */
- private function _updateEmail(array $data)
+ private function _updateEmail(array $data):void
  {
  $helper = $this->getHelper();
  $listId = $data['list_id'];
@@ -106,7 +106,7 @@ private function _updateEmail(array $data)
  * @param array $data
  * @return void
  */
- private function _clean(array $data)
+ private function _clean(array $data):void
  {
  //Delete subscriber from Magento
  $helper = $this->getHelper();
@@ -127,7 +127,7 @@ private function _clean(array $data)
  * @param array $data
  * @return void
  */
- private function _subscribe(array $data)
+ private function _subscribe(array $data):void
  {
  try {
  $subscribe = true;
@@ -143,7 +143,7 @@ private function _subscribe(array $data)
  * @param array $data
  * @return void
  */
- private function _unsubscribe(array $data)
+ private function _unsubscribe(array $data):void
  {
  $helper = $this->getHelper();
  $subscriber = $helper->loadListSubscriber($data['list_id'], $data['email']);
@@ -182,12 +182,12 @@ private function _unsubscribe(array $data)
  * @param array $data
  * @throws Mage_Core_Exception
  */
- function _profile(array $data)
+ function _profile(array $data):void
  {
  $this->getMailchimpTagsModel()->processMergeFields($data);
  }
 
- function deleteProcessed()
+ function deleteProcessed():void
  {
  $helper = $this->getHelper();
  $resource = $helper->getCoreResource();